This is frequently asked question about the cascader component. Adding a FAQ section would help more users who have the same problem.

https://stackoverflow.com/questions/60320913/ng-zorro-cascader-lazy-load-data-nzloaddata-function-got-this-undefined/60928983#60928983

作者你好
后续是否会扩展顶部菜单呢，项目内容比较多的时候，可能会在头部分出子系统，不同的子系统，加载不同的侧边栏

This set of attributes should be an attribute set.

This is not the only place where magic attributes occur in the PDF plugin, but it's impossible to address everything at once.

layout: 'side' | 'top' | 'mix'; 不同路径使用不同 layout 模式